Visible Light Driven Photoelectrochemical Properties of TiiO sub(2) Nanowire Electrodes Sensitized with Core-Shell Agg sub(2)S Nanoparticles

We present a model electrode system comprised of nanostructured Ti electrode sensitized with Agg sub(2)S core-shell nanoparticles (NPs) for visible light driven photoelectrochemistry studies. The nanostructured Ti electrode is coated with TiiO sub(2) nanowires (NW) to provide a high surface area for...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2014-12, Vol.118 (49), p.14037-14046
Main Authors: Shan, Zhichao, Clayton, Daniel, Pan, Shanlin, Archana, Panikar Sathyaseelan, Gupta, Arunava
Format: Article
Language:English
Subjects:
Charge
Collection
Electrodes
Nanoparticles
Nanostructure
Nanowires
Surface area
Titanium
X-ray photoelectron spectroscopy
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Summary:We present a model electrode system comprised of nanostructured Ti electrode sensitized with Agg sub(2)S core-shell nanoparticles (NPs) for visible light driven photoelectrochemistry studies. The nanostructured Ti electrode is coated with TiiO sub(2) nanowires (NW) to provide a high surface area for improved light absorption and efficient charge collection from the Agg sub(2)S NPs. Pronounced photoelectrochemical responses of Agg sub(2)S NPs under visible light were obtained and attributed to collective contributions of visible light sensitivity of Ag sub(2)S, the local field enhancement of Ag surface plasmon, enhanced charge collection by TiiO sub(2) NWs, and the high surface area of the nanostructured electrode system. The shell thickness and core size of the Agg sub(2)S core-shell structure can be controlled to achieve optimal photoelectrochemical performance. XPS, XRD, SEM, high resolution TEM, AC impedance, and other electrochemical methods are applied to resolve the structure-function relationship of the nanostructured Agg sub(2)S NP electrode.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp504346k